【摘要】 采用反应谱法和时程分析法,对位于首都机场的四机位机库进行了竖向、水平及其组合地震反应分析,考察地震作用对大跨度维修机库屋盖结构的影响。分析结果表明:屋盖杆件在竖向地震作用下的内力分布与在水平地震作用下的有明显的不同,也不同于一般四边支承的大跨度屋盖结构;屋盖结构的水平地震作用大于竖向地震作用;在三向地震作用下屋盖杆件的地震内力分布不同于任何单向地震作用情况,也不是三向地震的简单组合;网架与大门架、中梁桁架连接的部位,大门架、中梁桁架及网架静内力较小的杆件,中弦杆件及网架周边杆件是屋盖结构在地震作用下的薄弱环节。分析结果可供大跨度维修机库结构抗震设计参考。更多还原

【Abstract】 The vertical,horizontal and combined seismic response analyses on the long-span hangar at Capital International Airport are carried out using the response spectrum method and the time-history analysis method respectively to investigate the effect of the earthquake action on the roof structure.The analysis results show that the internal force distribution of roof members under the vertical earthquake action is obviously different from that under the horizontal earthquake action,and also different from that of other long-span roof structures with four sides supported;the horizontal seismic response is larger than the vertical seismic response of the hangar roof;the internal force distribution of roof members under the combined earthquake action is different from that under the vertical earthquake action or any unidirectional horizontal earthquake action,and is not the simple combination of the internal force of roof members under the vertical and horizontal earthquake action;the weak links of the hangar roof under the earthquake action are the connection parts of the space truss,the fringe truss beam and the middle truss beam,the members with smaller static internal force of the space truss,the fringe truss beam and the middle truss beam,the middle chord members and the members around the space truss.The analysis results can be for the seismic design reference of the long-span hangar.更多还原